dhcp not keeping authorized servers in the list

Posted on 2014-09-15
Last Modified: 2014-10-06
we have a server running server 2012 that we are having to add a server to the dhcp table.  If we authorize a server and select the server it doesn't add to the list
Question by:johnpatbullock
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LVL 12

Expert Comment

by:David Paris Vicente
ID: 40324305
If I understood you.

You have:
1- Windows Server 2012 With DHCP
2-Other Server

And you want to add (2)Other server to the DHCP Server Authorized List.

Is this Other Server a new DHCP Server?
If  yes, is it also added to the Domain?

Author Comment

ID: 40325359
i apoligize there is only one server in this and yes it has server 2012.  We want it to be the only dhcp server and it doesn't stay in the list on the left when you open dhcp.  When i try to add it as an authorized server it lets me type the ip, hit ok, but after that it doesn't show up
LVL 12

Expert Comment

by:David Paris Vicente
ID: 40325497
Is it added to Domain this Windows 2012 Server?

If you run in the command line this command
netsh dhcp show server
, what are the Output?

Author Comment

ID: 40335745
When I run the command "netsh dhcp show server", the returning info is the correct ip address but the wrong machine name.  The machine name that it's displaying is the one when the machine was installed with but was changed later to be different.
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LVL 12

Assisted Solution

by:David Paris Vicente
David Paris Vicente earned 500 total points
ID: 40336356
Can you insert here the following ADSIEDIT properties:

1."Click Start, click Run, type Adsiedit.msc in the Open box, and then click OK.
2.Expand Configuration, expand CN=Configuration, expand CN=Services, and then click CN=NetServices.
3.Right-click CN=<var>Your_DHCP_Root</var>, and then click  Properties.
4.In the Select a property to view list, click DHCPServers."

And also provide the new and the old name of your DHCP server.

Or you can follow the following KB article in here, this is for W2k, but the steps are similar.

Author Comment

ID: 40336681
This is server 2012 and we do not see CN=Configuration, expand CN=Services, and then click CN=NetServices

This is available in earlier server OS but not in 2012 that we can find.  Please advise
LVL 12

Expert Comment

by:David Paris Vicente
ID: 40338750
That's strange.

On ADSIEDIT.MSC console, right click in ADSIEDIT-> Connect To->Select a well known Naming Context-> Dropdown List Select Configuration-> Ok

Then follow the my previous post.

Or tell us what you see

Accepted Solution

johnpatbullock earned 0 total points
ID: 40354734
We realized the second NIC card wasn't disabled which was keeping us from adding a new authorized dhcp server

We did also have to use David's recommendation to remove the old server name from authorized dhcp servers

Author Closing Comment

ID: 40363252
the nic card was the main issue with not being able to add a dhcp server

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